diff --git a/spa/plugins/audioconvert/merger.c b/spa/plugins/audioconvert/merger.c
index 7db00c94c..3446d1b27 100644
--- a/spa/plugins/audioconvert/merger.c
+++ b/spa/plugins/audioconvert/merger.c
@@ -973,6 +973,7 @@ static int port_set_format(void *object,
 				port->have_format = false;
 			else
 				port->have_format = this->have_profile;
+			port->format.info.raw.rate = 0;
 			clear_buffers(this, port);
 		}
 	} else {
diff --git a/spa/plugins/audioconvert/splitter.c b/spa/plugins/audioconvert/splitter.c
index 4787d8753..a268b9fb0 100644
--- a/spa/plugins/audioconvert/splitter.c
+++ b/spa/plugins/audioconvert/splitter.c
@@ -732,6 +732,7 @@ static int port_set_format(void *object,
 				port->have_format = this->have_profile;
 			else
 				port->have_format = false;
+			port->format.info.raw.rate = 0;
 			clear_buffers(this, port);
 		}
 	} else {